Update README.md

README.md

@@ -138,12 +138,17 @@
 
 ## License
 ```
-Copyright 2019, hegaojian 
-
-   GNU GENERAL PUBLIC LICENSE
-                       Version 3, 29 June 2007
+ Copyright 2019, hegaojian       
+  
+   Licensed under the Apache License, Version 2.0 (the "License");
+   you may not use this file except in compliance with the License.
+   You may obtain a copy of the License at 
+ 
+       http://www.apache.org/licenses/LICENSE-2.0 
 
- Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
- Everyone is permitted to copy and distribute verbatim copies
- of this license document, but changing it is not allowed.
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License.
 ```